Documentation for Ubix Scheduler.

Definitions:

Task - In Ubix, a task is a group of instructions to run on the processor.  Typically, this is in the form of a program THREAD.

Process - A grouping of one or more tasks, usually loaded from an executable file.  All of the tasks in a process will share the same ADDRESS SPACE.  When a process is created, it will initially contain one task.

Thread - Term used in unix environments to describe an Ubix TASK.

Address Space - Section of virtual memory to which a task has access to.

Priority - Importance placed on a task when the scheduler chooses a task to run.  There are two different types of priority in Ubix.  A static priority is given when a task is created.  In addition, a task contains a dynamic priority which is usually the same as the static priority.  At times, such as to prevent priority inversion or to minimize the running of a CPU hogging task, this dynamic priority is changed.  Ubix will implement 32 different priorities, 31 being the highest priority and 0 being the lowest.